How to add new group entry in Cisco Vpn using powershell

I am working on a powershell script to connect cisco vpn using powershell, I am able to connect to vpn but not sure how to add new group to vpn. I am using the following script
$vpn_profile = 'Test'

$username = 'TestUser'
$userPassword = ConvertTo-SecureString -String "Password" -AsPlainText -Force
$credentials = new-object -typename System.Management.Automation.PSCredential -argumentlist    
$username,$userPassword
$password = $credentials.GetNetworkCredential().Password

Set-Location 'c:\Program Files (x86)\Cisco Systems\VPN Client'
.\vpnclient.exe connect $vpn_profile user $username pwd $password
Write-Host "You Are Connected"
cd "C:\"